Disguised himself with ashes upon his face - It does not immediately appear how putting ashes upon his face could disguise him. Instead of אפר apher, dust, Houbigant conjectures that it should be אפד aphad, a fillet or bandage. It is only the corner of the last letter which makes the difference; for the ד daleth and ר resh are nearly the same, only the shoulder of the former is square, the latter round. That bandage, not dust, was the original reading, seems pretty evident from its remains in two of the oldest versions, the Septuagint and the Chaldee; the former has Και κατεδησατο εν τελαμωνι τους οφθαλμους αυτου, "And he bound his eyes with a fillet." The latter has במעפריאעינוהי וכריך ukerich bemaaphira einohi ; "And he covered his eyes with a cloth." The MSS. of Kennicott and De Rossi contain no various reading here; but bandage is undoubtedly the true one. However, in the way of mortification, both the Jews and Hindoos put ashes upon their heads and faces, and make themselves sufficiently disgusting.
Ashes - Rather, “a bandage” (and in 1 Kings 20:41). The object of the wound and bandage was double. Partly, it was to prevent Ahab from recognizing the prophet‘s face; partly, to induce him to believe that the man had really been engaged in the recent war.